chore: Remove TRREB references from Python modules

- Remove DimTRREBDistrict model and FactPurchases model
- Remove TRREBDistrict schema and AreaType enum
- Remove TRREBDistrictParser from geo parsers
- Remove load_trreb_districts from dimension loaders
- Remove create_district_map from choropleth figures
- Remove get_demo_districts and get_demo_purchase_data from demo_data
- Update summary metrics to remove purchase-related metrics
- Update callbacks to remove TRREB-related comments
- Update methodology page to remove TRREB data source section
- Update dashboard data notice to remove TRREB mention

Closes #49

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

portfolio_app/toronto/models/__init__.py

@@ -6,9 +6,8 @@ from .dimensions import (
     DimNeighbourhood,
     DimPolicyEvent,
     DimTime,
-    DimTRREBDistrict,
 )
-from .facts import FactPurchases, FactRentals
+from .facts import FactRentals
 
 __all__ = [
     # Base
@@ -18,11 +17,9 @@ __all__ = [
     "create_tables",
     # Dimensions
     "DimTime",
-    "DimTRREBDistrict",
     "DimCMHCZone",
     "DimNeighbourhood",
     "DimPolicyEvent",
     # Facts
-    "FactPurchases",
     "FactRentals",
 ]

portfolio_app/toronto/models/dimensions.py

@@ -23,20 +23,6 @@ class DimTime(Base):
     is_month_start: Mapped[bool] = mapped_column(Boolean, default=True)
 
 
-class DimTRREBDistrict(Base):
-    """TRREB district dimension table with PostGIS geometry."""
-
-    __tablename__ = "dim_trreb_district"
-
-    district_key: Mapped[int] = mapped_column(
-        Integer, primary_key=True, autoincrement=True
-    )
-    district_code: Mapped[str] = mapped_column(String(3), nullable=False, unique=True)
-    district_name: Mapped[str] = mapped_column(String(100), nullable=False)
-    area_type: Mapped[str] = mapped_column(String(10), nullable=False)
-    geometry = mapped_column(Geometry("POLYGON", srid=4326), nullable=True)
-
-
 class DimCMHCZone(Base):
     """CMHC zone dimension table with PostGIS geometry."""
 

portfolio_app/toronto/models/facts.py

@@ -6,37 +6,6 @@ from sqlalchemy.orm import Mapped, mapped_column, relationship
 from .base import Base
 
 
-class FactPurchases(Base):
-    """Fact table for TRREB purchase/sales data.
-
-    Grain: One row per district per month.
-    """
-
-    __tablename__ = "fact_purchases"
-
-    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
-    date_key: Mapped[int] = mapped_column(
-        Integer, ForeignKey("dim_time.date_key"), nullable=False
-    )
-    district_key: Mapped[int] = mapped_column(
-        Integer, ForeignKey("dim_trreb_district.district_key"), nullable=False
-    )
-    sales_count: Mapped[int] = mapped_column(Integer, nullable=False)
-    dollar_volume: Mapped[float] = mapped_column(Numeric(15, 2), nullable=False)
-    avg_price: Mapped[float] = mapped_column(Numeric(12, 2), nullable=False)
-    median_price: Mapped[float] = mapped_column(Numeric(12, 2), nullable=False)
-    new_listings: Mapped[int] = mapped_column(Integer, nullable=False)
-    active_listings: Mapped[int] = mapped_column(Integer, nullable=False)
-    avg_dom: Mapped[int] = mapped_column(Integer, nullable=False)  # Days on market
-    avg_sp_lp: Mapped[float] = mapped_column(
-        Numeric(5, 2), nullable=False
-    )  # Sale/List ratio
-
-    # Relationships
-    time = relationship("DimTime", backref="purchases")
-    district = relationship("DimTRREBDistrict", backref="purchases")
-
-
 class FactRentals(Base):
     """Fact table for CMHC rental market data.